Paul,
If you are thinking of using it to make the looooong run to and from Aberdeen, I'd look for something fuel efficient - I like the LWB 2.0 diesel Suzuki Vitara, as it scrapes the bottom of 40mpg, has loads of room, reasonable road manners and is light enough not to bugger up the ground if the going is a bit soft off road. Someone sold a mint one on here a few months ago for £800 with years of life left in it. If you want to spend a bit more, look at the four door Toyota Rav4 - fits the same criteria.
You can pick up Shoguns, Troopers etc dirt cheap but they will be thirsty on long motorway runs. I'd like to see you and Mumbles trying to get in and out of a Suzuki Jimny
I know where there's a very well used Disco' going cheap - smells of chip fat and dead stuff but knows its own way to Scotland...
A.